One way to solve it is available at:http://support.microsoft.com/default.aspx?scid=kb;en-us;890893 pretty much the cause of the problems is that:This issue occurs because the Network Service account that Virtual Server uses does not have permission to write...

Configure the Client ComputersTo use File Services for Macintosh to share folders on the server with the client computers, configure the client computers as follows:• Install Microsoft User Authentication Module (UAM) on the client...